Title :
Array beamforming for long code CDMA under carrier drift
Author :
Drumright, Thomas A. ; Tabarrok, Amir Ali ; Ding, Zhi
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA
Abstract :
We present a blind array beamforming method for the detection of aperiodic CDMA signals in the presence of an unknown carrier drift. This method employs a differential array beamforming algorithm (DABA), which utilizes the known spreading code of the desired user to estimate the signal subspace under carrier drift. Successful beamforming enables better carrier drift estimation before detecting user data symbols. Simulations are performed in order to compare this method with an existing subspace technique, as well as two baseline (Weiner filter and single element matched filter) detectors.
Keywords :
array signal processing; code division multiple access; parameter estimation; signal detection; spread spectrum communication; DS-CDMA; Wiener filter; aperiodic CDMA; blind beamforming; carrier drift estimation; differential array beamforming algorithm; long code CDMA; matched filter; signal detection; signal subspace estimation; spreading code; Array signal processing; Detectors; Frequency estimation; Linear antenna arrays; Matched filters; Multiaccess communication; Multiuser detection; Phase estimation; Receiving antennas; Transmitting antennas;
Conference_Titel :
Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
Print_ISBN :
0-7803-7974-8
DOI :
10.1109/GLOCOM.2003.1258617
